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+{
+ "metadata": {
+  "name": "ch6"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.1 Using Direct Access on Arrays\n'''\n\na = [0, 0, 0]\na[2] = 55.55\na[0] = 11.11\na[1] = 33.33\nprint \"a[0] = \" , a[0] \nprint \"a[1] = \" , a[1] \nprint \"a[2] = \" , a[2] \n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "a[0] =  11.11\na[1] =  33.33\na[2] =  55.55\n"
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.2 Printing a Sequence in Order\n'''\n\nSIZE=5 # defines the size N for 5 elements\na = []\n# declares the array's elements as type double\nprint \"Enter \" , SIZE , \" numbers:\\t\"\nfor i in range(SIZE):\n    a.append(float(raw_input()))\n    \nprint \"In reverse order: \"\nfor i in range(SIZE-1,-1,-1):\n    print \"\\t\" , a[i]\n\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "Enter  5  numbers:\t\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "1\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "2\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "3.3\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "4.4\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "5.5\n"
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "In reverse order: \n\t5.5\n\t4.4\n\t3.3\n\t2.0\n\t1.0\n"
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.3 Initializing an Array\nThis program initializes the array a and then prints its values:\n'''\n\na = [ 22.2, 44.4, 66.6 ]\n\nsize = len(a)\nfor i in range(size):\n    print \"\\ta[\" , i , \"] = \" , a[i]\n\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "\ta[ 0 ] =  22.2\n\ta[ 1 ] =  44.4\n\ta[ 2 ] =  66.6\n"
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.4 Initializing an Array with Trailing Zeros\n'''\n\na = [ 22.2, 44.4, 66.6 , 0 ,0,0,0]\nsize = len(a)\nfor i in range(size):\n    print \"\\ta[\" , i , \"] = \" , a[i] \n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "\ta[ 0 ] =  22.2\n\ta[ 1 ] =  44.4\n\ta[ 2 ] =  66.6\n\ta[ 3 ] =  0\n\ta[ 4 ] =  0\n\ta[ 5 ] =  0\n\ta[ 6 ] =  0\n"
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.5 An Uninitialized Array\nNOte : In PYthon , we have to initialize array. Without initializing it, it doesn't work.\nArray size is automatically incremented when we push data into it.\n'''\nimport numpy\nSIZE = 4\na = numpy.zeros(4)\n# declares the array's elements as type float\nfor i in range(SIZE):\n    print \"\\ta[\" , i , \"] = \" , a[i]\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "\ta[ 0 ] =  0.0\n\ta[ 1 ] =  0.0\n\ta[ 2 ] =  0.0\n\ta[ 3 ] =  0.0\n"
+      }
+     ],
+     "prompt_number": 5
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.6 Allowing an Array Index to Exceed its Bounds\nNOte : Python gives error when this kind of error occurs. so It wont print garbage values after bound exceeds.\n'''\nSIZE=4\na = [ 33.3, 44.4, 55.5, 66.6 ]\nfor i in range(7): # ERROR: index is out of bounds!\n    print \"\\ta[\" , i , \"] = \" , a[i] \n\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "ename": "IndexError",
+       "evalue": "list index out of range",
+       "output_type": "pyerr",
+       "traceback": [
+        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mIndexError\u001b[0m                                Traceback (most recent call last)",
+        "\u001b[1;32m<ipython-input-6-248fbb50a5b0>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[0ma\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m \u001b[1;36m33.3\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m44.4\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m55.5\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m66.6\u001b[0m \u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      7\u001b[0m \u001b[1;32mfor\u001b[0m \u001b[0mi\u001b[0m \u001b[1;32min\u001b[0m \u001b[0mrange\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;36m7\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m:\u001b[0m \u001b[1;31m# ERROR: index is out of bounds!\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 8\u001b[1;33m     \u001b[1;32mprint\u001b[0m \u001b[1;34m\"\\ta[\"\u001b[0m \u001b[1;33m,\u001b[0m \u001b[0mi\u001b[0m \u001b[1;33m,\u001b[0m \u001b[1;34m\"] = \"\u001b[0m \u001b[1;33m,\u001b[0m \u001b[0ma\u001b[0m\u001b[1;33m[\u001b[0m\u001b[0mi\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      9\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n",
+        "\u001b[1;31mIndexError\u001b[0m: list index out of range"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "\ta[ 0 ] =  33.3\n\ta[ 1 ] =  44.4\n\ta[ 2 ] =  55.5\n\ta[ 3 ] =  66.6\n\ta[ 4 ] = "
+      }
+     ],
+     "prompt_number": 6
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.7 Causing Side Effects\nThis program inadvertently changes the value of a variable when it accesses a nonexistent element of\nan array:\nNote : Python automatically increase size of array/list. so it wont give error and output would be differ than c gives.\n'''\n\na = [ 22.2, 44.4, 66.6 ]\nx=11.1\nprint \"x = \" , x \na.append(88.8) # ERROR: index is out of bounds!\nprint \"x = \" , x \n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": " x =  11.1\nx =  11.1\n"
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.8 Causing Unhandled Exceptions\nThis program crashes because the array index gets too big:\n'''\na = [ 22.2, 44.4, 66.6 ]\nx=11.1\nprint \"x = \" , x \na[3333] = 88.8 # ERROR: index is out of bounds!\nprint \"x = \" , x \n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "ename": "IndexError",
+       "evalue": "list assignment index out of range",
+       "output_type": "pyerr",
+       "traceback": [
+        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mIndexError\u001b[0m                                Traceback (most recent call last)",
+        "\u001b[1;32m<ipython-input-8-63b6c8e60294>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m      6\u001b[0m \u001b[0mx\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m11.1\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      7\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;34m\"x = \"\u001b[0m \u001b[1;33m,\u001b[0m \u001b[0mx\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 8\u001b[1;33m \u001b[0ma\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m3333\u001b[0m\u001b[1;33m]\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;36m88.8\u001b[0m \u001b[1;31m# ERROR: index is out of bounds!\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m      9\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;34m\"x = \"\u001b[0m \u001b[1;33m,\u001b[0m \u001b[0mx\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
+        "\u001b[1;31mIndexError\u001b[0m: list assignment index out of range"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "x =  11.1\n"
+      }
+     ],
+     "prompt_number": 8
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.9 Passing an Array to a Function that Returns its Sum\n'''\n\ndef sum_(a):\n    s = 0\n    for i in a:\n        s += i\n    return s\n    \na = [ 11, 33, 55, 77 ]\nprint \"sum(a) = \" , sum_(a) \n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "sum(a) =  176\n"
+      }
+     ],
+     "prompt_number": 10
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.10 Input and Output Functions for an Array\nThis program uses a read() function to input values into the array a interactively. Then it uses a\nprint() function to print the array:\n'''\ndef read(a):\n    print \"Enter integers. Terminate with 0:\\n\"\n    n = 1\n    while True:\n        n = int(raw_input(\"a[\" + str(len(a)) + \"]: \"))\n        if n == 0:\n            break\n        a.append(n)\n        \n\ndef print_(a):\n    for i in a:\n        print i ,\n\n\na = []\nread(a)\nprint \"The array has \" , len(a) , \" elements: \"\nprint_(a)\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "Enter integers. Terminate with 0:\n\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "a[0]: 11\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "a[1]: 22\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "a[2]: 33\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "a[3]: 44\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "a[4]: 0\n"
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "The array has  4  elements: \n11 22 33 44\n"
+      }
+     ],
+     "prompt_number": 12
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.11 Printing the Memory Location of an Array\nThis program prints the value of the address stored in an array name.\n'''\nimport sys\na = [ 22, 44, 66, 88 ]\nprint \"a = \" , id(a)  # the address of a[0]\n\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "a =  169156908\n"
+      }
+     ],
+     "prompt_number": 13
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.12 The Linear Search\nThis program tests a function that implements the Linear Search algorithm:\n'''\ndef index(x,a,n):\n    for i in range(len(a)):\n        if (a[i] == x):\n            return i\n    return n # x not found\n\na = [ 22, 44, 66, 88, 44, 66, 55 ]\nprint \"index(44,a,7) = \" , index(44,a,7)\nprint \"index(50,a,7) = \" , index(50,a,7) \n\n\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "index(44,a,7) =  1\nindex(50,a,7) =  7\n"
+      }
+     ],
+     "prompt_number": 14
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.13 The Bubble Sort\nThis program tests a function that implements the Bubble Sort algorithm.\n'''\ndef sort(a,n):\n    # bubble sort:\n    n = len(a)\n    for i in range(n):\n        # bubble up max{a[0..n-i]}:\n        for j in range(n-i-1):\n            if (a[j] > a[j+1]):\n                a[j],a[j+1] = a[j+1],a[j]\n\ndef print_(a):\n    for i in range(len(a)):\n        print a[i],\n    print ''\n    \na = [55.5, 22.5, 99.9, 66.6, 44.4, 88.8, 33.3, 77.7]\n\nprint_(a)\nsort(a,8)\nprint_(a)\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "55.5 22.5 99.9 66.6 44.4 88.8 33.3 77.7 \n22.5 33.3 44.4 55.5 66.6 77.7 88.8 99.9 \n"
+      }
+     ],
+     "prompt_number": 15
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.14 The Binary Search Algorithm\n'''\n\ndef index(x,a,n):\n    # PRECONDITION: a[0] <= a[1] <= ... <= a[n-1];\n    # binary search:\n    lo=0\n    hi=n-1\n    while (lo <= hi):\n        i = (lo + hi)/2 # the average of lo and hi\n        if (a[i] == x):\n            return i\n        if (a[i] < x):\n            lo = i+1 # continue search in a[i+1..hi]\n        else:\n            hi = i-1 # continue search in a[lo..i-1]\n    return n # x was not found in a[0..n-1]\n\na = [ 22, 33, 44, 55, 66, 77, 88 ]\nprint \"index(44,a,7) = \" , index(44,a,7)\nprint \"index(60,a,7) = \" , index(60,a,7) \n\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "index(44,a,7) =  2\nindex(60,a,7) =  7\n"
+      }
+     ],
+     "prompt_number": 16
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.15 Determining whether an Array is Sorted\nThis program tests a boolean function that determines whether a given array is nondecreasing.\n'''\n\ndef isNondecreasing(a,n):\n    # returns true iff a[0] <= a[1] <= ... <= a[n-1]:\n    for i in range(1,n):\n        if (a[i]<a[i-1]):\n            return False\n    return True\n\na = [ 22, 44, 66, 88, 44, 66, 55 ]\nprint \"isNondecreasing(a,4) = \" , isNondecreasing(a,4)\nprint \"isNondecreasing(a,7) = \" , isNondecreasing(a,7)\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "isNondecreasing(a,4) =  True\nisNondecreasing(a,7) =  False\n"
+      }
+     ],
+     "prompt_number": 17
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.16 Using the assert() Function to Enforce a Precondition\nThis program tests an improved version of the search() function from Example 6.14. This version\nuses the isNondecreasing() function from Example 6.15 to determine whether the array is sorted. It\npasses the resulting boolean return value to the assert() function so that the search will not be carried\nout if the array is not sorted:\n'''\n\ndef isNondecreasing(a,n):\n    # returns true iff a[0] <= a[1] <= ... <= a[n-1]:\n    for i in range(1,n):\n        if (a[i]<a[i-1]):\n            return False\n    return True\n\n\ndef index(x,a,n):\n    # PRECONDITION: a[0] <= a[1] <= ... <= a[n-1];\n    # binary search:\n    assert(isNondecreasing(a,n))      \n        \n    lo=0\n    hi=n-1\n    while (lo <= hi):\n        i = (lo + hi)/2\n        if (a[i] == x):\n            return i\n        if (a[i] < x):\n            lo = i+1  # continue search in a[i+1..hi]\n        else:\n            hi = i-1  # continue search in a[lo..i-1]\n    return n  # x was not found in a[0..n-1]\n\na = [ 22, 33, 44, 55, 66, 77, 88, 60 ]\nprint \"index(44,a,7) = \" , index(44,a,7) \nprint \"index(44,a,8.py) = \" , index(44,a,8) \nprint \"index(60,a,7) = \" , index(60,a,8)\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "ename": "AssertionError",
+       "evalue": "",
+       "output_type": "pyerr",
+       "traceback": [
+        "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m\n\u001b[1;31mAssertionError\u001b[0m                            Traceback (most recent call last)",
+        "\u001b[1;32m<ipython-input-18-3a784dd6b25e>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m     34\u001b[0m \u001b[0ma\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;33m[\u001b[0m \u001b[1;36m22\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m33\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m44\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m55\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m66\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m77\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m88\u001b[0m\u001b[1;33m,\u001b[0m \u001b[1;36m60\u001b[0m \u001b[1;33m]\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     35\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;34m\"index(44,a,7) = \"\u001b[0m \u001b[1;33m,\u001b[0m \u001b[0mindex\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;36m44\u001b[0m\u001b[1;33m,\u001b[0m\u001b[0ma\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;36m7\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 36\u001b[1;33m \u001b[1;32mprint\u001b[0m \u001b[1;34m\"index(44,a,7) = \"\u001b[0m \u001b[1;33m,\u001b[0m \u001b[0mindex\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;36m44\u001b[0m\u001b[1;33m,\u001b[0m\u001b[0ma\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;36m8\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m     37\u001b[0m \u001b[1;32mprint\u001b[0m \u001b[1;34m\"index(60,a,7) = \"\u001b[0m \u001b[1;33m,\u001b[0m \u001b[0mindex\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;36m60\u001b[0m\u001b[1;33m,\u001b[0m\u001b[0ma\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;36m8\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
+        "\u001b[1;32m<ipython-input-18-3a784dd6b25e>\u001b[0m in \u001b[0;36mindex\u001b[1;34m(x, a, n)\u001b[0m\n\u001b[0;32m     18\u001b[0m     \u001b[1;31m# PRECONDITION: a[0] <= a[1] <= ... <= a[n-1];\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     19\u001b[0m     \u001b[1;31m# binary search:\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m---> 20\u001b[1;33m     \u001b[1;32massert\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0misNondecreasing\u001b[0m\u001b[1;33m(\u001b[0m\u001b[0ma\u001b[0m\u001b[1;33m,\u001b[0m\u001b[0mn\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m\u001b[0;32m     21\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m     22\u001b[0m     \u001b[0mlo\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m0\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n",
+        "\u001b[1;31mAssertionError\u001b[0m: "
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "index(44,a,7) =  2\nindex(44,a,7) = "
+      }
+     ],
+     "prompt_number": 18
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.17 Enumerating the Days of the Week\nThis program defines an array high[] of seven floats, representing the high temperatures for\nthe seven days of a week: 138\n'''\nDay =  [ 0, 1, 2, 3, 4, 5, 6 ]\nhigh = [ 88.3, 95.0, 91.2, 89.9, 91.4, 92.5, 86.7]\n\nfor i in Day:\n    print \"The high temperature for day \" , i , \" was \" , high[i] \n\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": " The high temperature for day  0  was  88.3\nThe high temperature for day  1  was  95.0\nThe high temperature for day  2  was  91.2\nThe high temperature for day  3  was  89.9\nThe high temperature for day  4  was  91.4\nThe high temperature for day  5  was  92.5\nThe high temperature for day  6  was  86.7\n"
+      }
+     ],
+     "prompt_number": 19
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.18 The Bubble Sort Again\n'''\n\ndef sort(a,n):\n    a.sort()\n\ndef print_(a,n):\n    for i in a:\n        print i,\n    print ''\na = [55.5, 22.5, 99.9, 66.6, 44.4, 88.8, 33.3, 77.7]\nprint_(a,8);\nsort(a,8)\nprint_(a,8)\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "55.5 22.5 99.9 66.6 44.4 88.8 33.3 77.7 \n22.5 33.3 44.4 55.5 66.6 77.7 88.8 99.9 \n"
+      }
+     ],
+     "prompt_number": 20
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.19 Reading and Printing a Two-Dimensional Array\nThis program shows how a two-dimensional array can be processed:\n'''\n\ndef read(a):\n    print \"Enter 15 integers, 5 per row:\\n\"\n    for  i in range(3):\n        ar = []\n        print \"Row \" , i , \": \",\n        for j in range(5):\n            ar.append(int(raw_input()))\n        a.append(ar)\n\ndef print_(a):\n    for  i in range(3):\n        for j in range(5):\n            print a[i][j],\n        print ''\na = []\nread(a)\nprint_(a)\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "Enter 15 integers, 5 per row:\n\nRow  0 : "
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "44\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "77\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "33\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "11\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "44\n"
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": " Row  1 : "
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "60\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "50\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "30\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "90\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "70\n"
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": " Row  2 : "
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "85\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "25\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "45\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "45\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "55\n"
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": " 44 77 33 11 44 \n60 50 30 90 70 \n85 25 45 45 55 \n"
+      }
+     ],
+     "prompt_number": 21
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.20 Processing a Two-Dimensional Array of Quiz Scores\n'''\ndef read(score):\n    for s in range(3):\n        print  \"Student \" , s , \": \",\n        st = []\n        for q in range(5):\n            st.append(int(raw_input()))\n        score.append(st)\n\ndef printQuizAverages(score):\n    for s in range(3):\n        sm = 0\n        for q in range(5):\n            sm += score[s][q]\n        print \"\\tStudent \" ,  s , \": \" , sm/5.0\n\ndef printClassAverages(score):\n    for q in range(5):\n        sm = 0\n        for s in range(3):\n            sm += score[s][q]\n        print \"\\tQuiz \" , q , \": \" , sm/3.0\n\n\n\nNUM_STUDENTS = 3\nNUM_QUIZZES = 5\n\n\nscore = []\nprint \"Enter \" , NUM_QUIZZES , \" scores for each student: \"\nread(score)\nprint \"The quiz averages are:\"\nprintQuizAverages(score)\nprint \"The class averages are: \"\nprintClassAverages(score)\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "Enter  5  scores for each student: \nStudent  0 : "
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "8\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "7\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "9\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "8\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "9\n"
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": " Student  1 : "
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "9\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "9\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "9\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "9\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "8\n"
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": " Student  2 : "
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "5\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "6\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "7\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "8\n"
+      },
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "9\n"
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": " The quiz averages are:\n\tStudent  0 :  8.2\n\tStudent  1 :  8.8\n\tStudent  2 :  7.0\nThe class averages are: \n\tQuiz  0 :  7.33333333333\n\tQuiz  1 :  7.33333333333\n\tQuiz  2 :  8.33333333333\n\tQuiz  3 :  8.33333333333\n\tQuiz  4 :  8.66666666667\n"
+      }
+     ],
+     "prompt_number": 24
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "'''\nEXAMPLE 6.21 Processing a Three-Dimensional Array\nThis program simply counts the number of zeros in a three-dimensional array:\n'''\n\ndef numZeros(a,n1,n2,n3):\n    count = 0\n    for i in range(n1):\n        for j in range(n2):\n            for k in range(n3):\n                if (a[i][j][k] == 0):\n                    count += 1\n    return count\n\n\na = [ [ [5,0,2], [0,0,9], [4,1,0], [7,7,7] ],[ [3,0,0], [8,5,0], [0,0,0], [2,0,9] ]]\nprint \"This array has \" , numZeros(a,2,4,3) , \" zeros\"\n\n",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "This array has  11  zeros\n"
+      }
+     ],
+     "prompt_number": 25
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "",
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file